JPH07180731A - Braking device - Google Patents

Abstract

PURPOSE:To provide a braking device which is so small in size as to be suitable for a small structure such as a micro-machine, toys and the like, is powerful in braking force, and also is simple in working and assembly. CONSTITUTION:Two relatively moving substances such as a case 10 and a gear 11 installed within the case 10, are provided with plane sections 17 and 18 faced to the aforesaid substances with a constant gap 19 maintained, each elastic film 23 is bonded on the plane section 18 on the case 10 side with the periphery of each film kept airtight, and is so constituted as to be faced to the back face of the elastic film 23 while being faced to the opening end of each fluid passage 21 in each place enclosed by the aforesaid periphery, and the brake is so designed as to be applied by feeding fluid at specified pressure, letting each elastic film 23 be expanded, and thereby letting it be brought in contact with the plane section 17 of the gear 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake device suitable for use in small structures such as micromachines and toys.

[0002]

2. Description of the Related Art A mainspring is known as a simple and small drive device used for small structures such as micromachines and toys. Cannot be controlled, and the controllability is poor.

A brake device may be added to provide controllability, but if the brake device has a complicated structure, the size will be large and the cost will be high. Therefore, it is suitable for the small structure as described above. Not.

As a brake device having a simple structure, one using a rubber elastic film as shown in FIG. 3 is known (see Japanese Patent Laid-Open No. 3-277832). This is because the endless tube 1 having a flat cross section is formed by a rubber elastic film, and the outer peripheral surface of the short cylinder 2 housed inside is integrated with the inner peripheral surface of the outer wall of the tube 1. The inlet / outlet 3 is projected outside the tube 1. The shaft 4 is inserted into the inner diameter of the tube 1.

When the fluid is supplied from the fluid inlet / outlet 3, the tube 1 expands, the frictional force with the shaft 4 increases, and the brake is applied. On the contrary, when the fluid in the tube 1 is caused to flow out, the frictional force is reduced and the brake is released.

[0006]

Providing a braking device including the tube 1 as described above around the shaft 4 is as follows.
Small structures are often difficult to process and assemble. Also, since the shaft 4 is thin in a small structure, the tube 1
There is also a problem that the contact area with the wheel is small, and therefore a sufficient braking force cannot be obtained.

Therefore, an object of the present invention is to provide a brake device suitable for a small structure which is easy to process and assemble and which can obtain a large braking force.

[0008]

In order to achieve the above-mentioned object, the present invention is to provide two flat bodies facing each other with a constant gap between two bodies which move relative to each other, and to provide a peripheral edge on one of the flat planes. Is airtightly held, an elastic film is joined thereto, the elastic film is opposed to the back surface of the elastic film, and the opening end of the fluid passage is exposed within the range surrounded by the periphery of the elastic film.

[0009]

When the fluid is supplied to the back surface of the elastic film through the fluid passage, the elastic film expands due to the pressure of the fluid and comes into contact with the other opposing flat surface portion, and a brake is applied between two objects that move relative to each other. Takes. When the fluid passage is opened, the elastic membrane returns to its original state by its own elasticity, and the brake is released.

[0010]

1 and 2, a large gear 11 and a small gear 12 meshing with the large gear 11 are freely rotatable by bearings 13 and 14 between opposing walls of a case 10. Supported by. The shaft 15 of the large gear 11 is connected to a power source such as a mainspring (not shown), and the small gear 1
The second shaft 16 is connected to a load such as a wheel (not shown).

There is a constant gap 19 between the flat surface portion 17 of one side of the large gear 11 and the flat surface portion 18 of the inner wall surface of the case 10, and the flat surface portion 18 of the case 10 facing the gap 19 is present. The annular groove 20 is formed, and the annular groove 2 is formed.
The fluid passage 21 communicating with 0 penetrates the wall surface of the case 10 on the flat surface portion 18 side. A hose 22 is connected to the outer end of the fluid passage 21.

An annular elastic film 23 made of rubber or the like is adhered to the flat surface portion 18 of the case 10. This elastic film 23
Has a width across both sides of the annular groove 20 and has an inner peripheral edge 24
The outer peripheral edge 25 is airtightly fixed to the flat portion 18 of the case 10 by an adhesive or a fastening member such as a band. The elastic film 23 is provided in the annular groove 20 through the fluid passage 21.
A fluid is used which expands due to the pressure of the fluid supplied to it (see the alternate long and short dash line in FIG. 1) and has elasticity enough to contact the plane portion 17 of the large gear 11.

The brake device of the embodiment is as described above, and in a normal state, there is a constant gap 19 between the elastic film 23 and the flat portion 17 of the large gear 11, and the brake is not applied. Fluid of required pressure (air, water,
When oil or the like) is supplied, the elastic film 23 expands and comes into contact with the flat surface portion 17 of the large gear 11, and a brake having a size corresponding to the degree of expansion is applied.

When the fluid passage 21 is opened, the elastic film 23 returns to its original state by its own elasticity, and the brake is released.

Although the elastic film 23 is brought into contact with the plane portion 17 of the large gear 11 in the above, the large gear 1
Instead of 1, the disk attached to the drive shaft may be provided, and the elastic film 23 may be brought into contact with the disk.

Further, the elastic film 23 does not necessarily have to be provided over the entire circumference, but if the sufficient frictional force is obtained, it is provided partially and the peripheral edge thereof is adhered, and the fluid passage 21 is provided.
The opening end of the elastic film 23 may face the back surface of the elastic film 23.

Further, the other flat portion 17 of the gear wheel 11 is provided.
Alternatively, a brake device having the same elastic film 23 as that described above may be provided in the case 10 facing the above, and the brake may be applied from both sides of the large gear 11.

In the embodiment described above, the two objects (case 10
Although the description has been given of the case where the gear and the large gear 11) relatively rotate, the present invention is also applied to the case where the two objects relatively move linearly. For example, linear slide bearing, X
A Y table, an XYθ table, a magnetic levitation slider, and the like. Also in these cases, similarly, an elastic film is provided on one of the opposed flat surface portions, the peripheral edge thereof is closely adhered, the opening end of the fluid passage is exposed to the back surface of the elastic film, and the elastic film is applied by the pressure of the fluid. Inflate, bring it into contact with the other flat and brake.

[0019]

As described above, according to the present invention, the elastic film for the brake is attached to one of the two opposed flat surfaces, and the elastic film is inflated so as to be brought into contact with the other. As compared with the case where an elastic film is attached, a sufficiently large contact area can be obtained and a large braking force can be obtained.

Further, since a small structure having a power source is provided with a disc-shaped mechanical element such as a gear, if a side face thereof is used, it is necessary to newly provide a disc for braking. It can be provided inexpensively.

Further, it is easier to form a groove or a passage in the flat portion of the inner wall of the case than to form a groove in the shaft, and it is also possible to bond the elastic film to the flat portion around the shaft. This can be done more easily than a tube-shaped elastic membrane.

Therefore, according to the present invention, it is possible to equip a small structure provided with a power source with a braking device having a large braking force, a simple structure, easy processing and assembling, and a low cost. As a result, the controllability of small structures is improved,
It is possible to construct a structure having a higher function.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment.

FIG. 2 is a sectional view taken along line II-II of the above.

FIG. 3 is a sectional view of a conventional example.

[Explanation of symbols]

 10 Case 11 Large Gear 12 Small Gear 13, 14 Bearing 15, 16 Shaft 17, 18 Plane 19 Gap 20 Annular Groove 21 Fluid Passage 22 Hose 23 Elastic Membrane 24 Inner Edge 25 Outer Edge

Claims (1)

[Claims] 1. A flat surface facing two objects that move relative to each other with a constant gap provided therebetween, and an elastic film is bonded to one of the flat parts by hermetically holding a peripheral edge thereof, and a back surface of the elastic film. A brake device facing the open end of the fluid passage in a range surrounded by the periphery of the fluid passage.